whats goin' on with my engine??? any ideas???

i went out to start my truck this morning and it started up fine, it was kind of cool out so the automatic choke came on, i let it run for a few minutes and when i tapped the gas to turn off the choke the rpms dropped really low and it stalled twice out of getting out of my driveway (its a really short driveway). so i drove up to school and it was idleing really rough and low, its usually very smooth, so i figure maybe i'm out of gas (it still says 1/2 a tank) so i go to the gas station and fill up but it only puts in 15 gallons, so it wasnt the gas. its a carburated 350 w/ less then 10K on the engine. any reason it was fine one day and rough the next /forums/images/graemlins/1zhelp.gif?

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